An micro-fine layer of EXP Coating is bonded to the phosphor bronze wrap wire which is then wound onto the hex-shaped core wire. The result is a built-in barrier against the corrosion and wear that can quickly sap the life out of your strings and your sound .

D’Addario’s EXP coated strings also now feature plain steel strings and hexagonal cores made of our revolutionary NY High Carbon Steel. Envisioned, perfected, and manufactured by D’Addario in New York, this newly engineered, break-resistant, high-carbon steel wire delivers unprecedented strength and pitch stability. Combined with the highest quality wrap wire materials, precision drawn and micro-coated on our advanced proprietary machinery, each EXP set maintains that familiar uncoated tone while adding up to 4 times more life.

EXPs are the longest lasting, most natural sounding coated strings you can buy!